Designing trustworthy e-services is a challenge currently undertaken by many actors concerned with the development of online applications. Many problems have been identified but a unified approach towards the process of engineering trustworthy e-services doesn't yet exist. This paper introduces a principled approach to deal with trust solutions in e-services based on a concern-oriented approach where end users' concerns serve as the starting point for the process to engineer appropriate solutions to trust related issues for an e-service. The trust management cycle is introduced and described in detail. We use an online application for reporting gas prices as validation of the proposed cycle.